Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47921a3f2e8a04c…

MALICIOUS

PDF

63.6 KB Created: 2021-05-21 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dca75d1bac3c3a2d92d286fab351b94b SHA-1: 6c800f8b130cac2c7d796e95a722ecc218667f59 SHA-256: d47921a3f2e8a04ceec28fe1c0e894f82e2ae4e49afaf0da7e44c6fcbceef44c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The document body, though partially corrupted, contains text related to an 'exercise' and metadata from wkhtmltopdf, which could be used to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd879e9f---4104510787.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/13dfcd50fdc3ce474aaa7a8bda17d10a/zubijajal.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d294318f5f---bivozanax.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972aad04618---87610954979.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9b78b85e778d58ca415279d23eb7dfc9/81863013573.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f7833cb6ce60a8e11120144a261e7e77/dugazodov.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/86923475952.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tevupekexigagado.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sglpdnsacjdko3dcq4d777l1k0/82166250203.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/josenimepefalepi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a630b07a4cdfc0bc350fea5d7d70d6ae/82343507747.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t8r79fgnrqucdqmgaamltpca30/wudixisutujubojeserivego.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/87b395618d5697f10be6cf685f6e2077/romaxuvuzudidepagetam.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2ikhoia2re9bka3vcfphvq23cv/vuvoz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b4af7cd---bidubilefogidugas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=exercice+pass%25C3%25A9+simple+6%25C3%25A8mePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 5540 bytes
SHA-256: 22d56a24a82daed7e80f584d64c9859c3f1fd63c4a03a729ad2f8d99f2c05c35

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